Manufacture of toothed bevel-gear wheels or crown-wheels



. I 0. R. OP PERMAN.

MANUFACTURE OF TOOTHED BEVEL GEAR WHEELS 0R CROWN WHEELS.

' APPLICATION FILED DEC-29,19I9.

1 352,02 1 Patented Sept. 7 1920.

UNITED. srarss E ATENT GFE 'EQE.

OTTO R. OFFER-LIAN, OE LONDUL, ENGLAND.

Application filed. December 29, 1919.

Be it known that l l'rro llUnoLr MAN, engineer, sub ect of the King of Great Britain and Ireland, whose post-oiiiee is 3 Albemarle street, London E. (l, 1, England, have invented certain new and useful Improvements in the lllanufacture or Toothecl Bevel-Gear lVheels or Crownll heels, of which the following is e speciii cation.

This invention relates to the manufacture of toothed bevel gear wheels or crown wheels and more particularly to light gears such as are employed for example in driv ing speedometers and has for its object to simplify and reduce the cost of manufao ture.

My invention is an improvement over those methods of manufacture hitherto a1 plieable to comparatively thin material wherein teeth are cut in the periphery of a fiat blank or ring and afterward bent out of the plane of the blank or ring.

According to this invention the wheels are first cut in the form or spur wheels and are then converted into bevel gears and crown bevel wheels by bending the teeth over at the required angle to form bevel teeth.

In carrying the invention into practical effect the bending over of the toothed part of the wheel is facilitated by cutting a.

groove around the whee at the roots of the teeth and then at the groove bending the teeth over toward the 'rooved side at the required angle to the rim.

The light gear wheels are usually made of steel of uniform thickness and tie teeth are readily pressed over to the required angle in a suitable press.

Serial No. 348,246.

in the aceemgenying sheet of illustrative and 2 are side eleyatien and verse section respectively of a portion gear wheel cut with spur teeth adapted bent to form a bevel gear.

igs. 8 and it are similar views to lfi 1 and 2 show" he teeth bent at the required angle. A

in forming gear as illuseted in Figs. 1 to i a ste l'ring or blank of uniform thicle ness is first cut with spur teeth (t several rings being preferably cut a the same time. groove 6 is then out erou 1d the rim 0 of F 'leOl formed adjacent to the 2 teeth as sh vn in i igs. l and or ressed over bent le to the plane of an; n in l* 3 and e- :een that by the method dois eonsideraiblj-j .eral g s can be 'embled nnele and the t eth cut in the ,t. .11 4.1 we the Jeri. OsC oi. the L: A ,v 4- -L 0. time. on and luh LQQbll over gle in the direction of the bevel or crown teeth.

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O. OPPEYl-LXN. 

